406552521 has 4 divisors (see below), whose sum is σ = 542070032. Its totient is φ = 271035012.

The previous prime is 406552513. The next prime is 406552529. The reversal of 406552521 is 125255604.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (406552513) and next prime (406552529).

It is not a de Polignac number, because 406552521 - 2³ = 406552513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (406552529) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67758751 + ... + 67758756.

It is an arithmetic number, because the mean of its divisors is an integer number (135517508).

Almost surely, 2^406552521 is an apocalyptic number.

It is an amenable number.

406552521 is a deficient number, since it is larger than the sum of its proper divisors (135517511).

406552521 is a wasteful number, since it uses less digits than its factorization.

406552521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135517510.

The product of its (nonzero) digits is 12000, while the sum is 30.

The square root of 406552521 is about 20163.1475965436. The cubic root of 406552521 is about 740.8078109283.

The spelling of 406552521 in words is "four hundred six million, five hundred fifty-two thousand, five hundred twenty-one".